Optimal filter design and switching loss reduction in grid connected inverter system

In this paper optimal design of LCL filter for grid connected inverter system is studied. For that, initially normal design is considered. Then the conduction and switching losses that are caused by the filter are calculated and are optimized considering the level of reduction of harmonics. Hence the main aim of the study is to attenuate higher order harmonics along with the reduction in switching losses to ensure sinusoidal current injection into the grid. Further, the different switching schemes for single phase unipolar full bridge inverter are studied and compared to get the switching scheme which gives lesser switching losses. The LCL filter is designed accordingly and optimal inductance and capacitance values are obtained. The complete model of the study is simulated in MATLAB-Simulink environment for feasibility of the study..